I'm getting the error 0x80072F06 "The security certificate on the server is not valid. Contact your Exchange Server administrator or ISP to install a valid certificate on the server" This is a mixed environment Exchange 2007 & Exchange 2003 (three servers peered together). The certificate is a Godaddy UCC cert and has been installed on each server and enabled in the Exchange cli. The domain was originally setup with an external domain of office.companyx.com but in the troubleshooting process and because we couldn't revoke the certificate for that domain to create a ucc cert we setup and new domain office.companyy.com and bought a ucc cert for it and all the internal server names as well as discovery. When I setup the phones I put in me@companyx.com and the server as office.companyy.com When I sync the phone ends up changing the server settings to office.companyx.com and I think that is why the cert error is coming up but I don't know where to change that settings. I've already gone into exchangemmc/server config/clientaccess/outlookanywhere and put it office.companyy.com (for the two 2007 boxes) but the phone is still getting the updated server. Any ideas?